Iran's deputy foreign minister said he did not believe the deal could survive without the US.

He wants all three strengthened if the United States is to stay in the JCPOA.

What is the Iran Nuclear Deal? .

Adding to those concerns, US President Donald Trump told the Europeans on January 12 they must agree to "fix the awful flaws of the Iran nuclear deal" or he would reimpose the sanctions Washington lifted as part of that pact.

Iran has yet to respond to the IAEA's request for "further clarifications and amplifications", the report said, adding that if Iran had reached a concrete decision to build new facilities for marine propulsion it must provide design information.

"For Iran, we are supposed to benefit from the sanctions' lifting", he said.

"If the same policy of confusion and uncertainties about the JCPOA (Joint Comprehensive Plan of Action) continues, if companies and banks are not working with Iran, we can not remain in a deal that has no benefit for us", Mr Araqchi said. As a result, Iran has struggled with domestic investments and foreign trade.

Abdullah Sameri, a member of the Iranian Parliament's Energy Commission, says German companies can make good investments in Khuzestan given the province's great potential in energy, agricultural, and industrial fields.

As a result, the economic gains Iran expected after it signed the deal have been stymied.

Despite insistence from the Iranian side that they have not seen economic benefits from the deal, President Trump has pointed out that they received cold hard cash from the Obama administration.

"If we lose the JCPOA, we will face another nuclear crisis", Mr Araqchi said. In 2016, President Hassan Rouhani ordered the start of planning on the development of nuclear marine propulsion in reaction to what he called USA violations of the nuclear deal.

"If the USA and Iran are not on the same page with regards to Iran's nuclear program, regardless of what the construct of the program looks like, it's going to be a point of contention because the United States is going to use coercive measures to punish Iran for having its program", he said. "Although the United States administration and Mr Trump are talking about sunset clause and that JCPOA is just for 10 years, that is not true", he said.

Second, it must ensure that Iran never even comes close to possessing a nuclear weapon. But mentioning it evokes both projecting military might and potentially enriching uranium beyond the limit of 3.67 percent purity imposed by the deal.

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